Oscillations in the centre of the pore’s large umbral core. Prominent umbral flashes occur at t = 9, 29, and 32 min. a) Temporal fluctuations of intensity at different wavelengths in the Ca II line profile. b) Same as a) but enhanced by subtraction of the mean line profile. c) Visualised temporal fluctuations of the Doppler (LOS) velocity. Redshifts are bright.
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